Core for forming automobile tires



A. GERMAN.

CORE FOR FORMING AUTOMOBILE TIRES.

APPLICATION FILED SEPT. 4. 1920.

1 ,427,528. Patented Aug. 29,- 1922,

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CORE FOR FORMING AUTOMOBILE TIRES.

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Application filed September To all whom it may concern:

Be it known that l, ALEXANDER GERMAN, a citizen of the United States, residing at Akron, in the county of Summit and State of Ohio, haveinvented certain new and useful improvements in Cores for Forming Automobile lines, of which the following is a specification, 'eference being had to the accompanylng drawings.

This invention relates to cores for forming automobile tires. D

.t n important object of the invention 1s to improve the construction of separable sec tion cores of the type shown in the patent to Nesbit, et .11., No. 1,297,226, patented. March 11, 1919. In construction of this core a plurality of separable sections is provided adapted when assembled to form an annulus upon which the tire is formed. Each of these sections is provided with inwardly eX- tending portions having formed in one side thereof grooves adapted when the sections are in assembled relation to combine to form an annular chamber into which is forced a locking ring whicn holds the sections of the core in assembled relation. Each of these sections is provided with an opening extending throughits inwardly extending portion to the bottom of the groove thereof, whereby a drift be inserted for the removal of the locking ring. It has been found in practice that in driving the locking ring into position the opposite side of the annulus is deformed bv the pressure exerted thereon, eventuallv resulting in the destruction of the core. I have descovered that by providing upon each of the sections upon the inwardly extended portions thereof, lugs, which extend outwardly from the face thereof a dis tance such that the face of the lug is spaced from the transverse axis of the core section the same distance or approximately the same distance that the face of the section extends therefrom this deformation is avoided, the pressure exerted upon the looking ring in forcing the same into posltion being exerted upon the lug or lugs.

In the accompanying drawings, wherein for the purpose of illustration is shown a preferred embodiment of my improvement, and wherein like reference characters designate like parts throughout:

Figure 1 is an elevational view of the core assembled.

Figure 2 is a radlal sectlonal vlew of the core, drawn to a larger scale.

Specification of Letters Patent.

Patented Aug.

29, 1922. 4-, 1920, Serial No. 408,141.

Figure 3 is a fragmentary perspective view of one of the sections of the core showing especially the construction of the side opposite to the one shown in Figure 1.

Referring now more particularly to the drawings, the core includes an annulus formed of a plurality of sections 1 and comprises a main body portion having its outer portion '1 substantially circular in cross section and an inwardly extending flange, 2, having an enlarged marginal portion, 3, providing shoulders 3 substantially perpendicular to the side of the flange. Abutting ends of the sections are preferably provided with interlocking tongues and grooves, 1 and one of these sections preferably tapers outwardly so that when the looking or maintaining ring is removed this section may be forced inwardly for collapsing the annulus.

The shoulders 8 of the enlarged portion, when the parts are in the assembled position, form complete annular abutment or flanges which shape the edges of the tire and cooperate with the metal sections in the manner well known to those familiar with the art.

The enlarged portion is provided in one side with an annular groove or channel 3", which is designed to receive a ring 4. In the usual construction of this type of core the channel and the ring are straight on the inside and tapered on the outside or taper both sides, so that the ring when forced into position will be maintained by friction. llpon the opposite face of each of the sections 1 upon the enlargement thereof at the ends, 1 form a lug 5 which extends outwardly from the face of the enlargement a sufiicient distance that the outer face thereof is spaced from the transverse or radial axis of the annulus a distance equal tothe radius of the circular outer portion, 1. It will be seen that when the sections of the core are laid upon a flat surface the inwardly extending flanges of these sections will be horizontally disposed and the pressure exerted in forcing in the ring l will be exerted upon the lug and not upon the inner edge of the enlargement 3 and the said face of the circular portion, 1, as heretofore.

Having now described my invention, what Iclaim is: I

1. A core of the character described comprising, a plurality of separate sections cirextending portions provided in one side thereof with grooves, which, in the assenibled condition of the sections, provide an annular channel, an annular locking ring adapted to be forced into and out of said channel by a substantially direct movement axial of the completed core and a lug formed upon the opposite face of each of said extensions having its outer face spaced from the radial axis of the core a distance approximately equal to the radius of the sections whereby deformation of said sections during application of said ring is prevented.

2. A core of the character described co1nprising, a plurality of separate sections having inwardly extending portions in one side thereof with grooves, which, in the assembled condition of the sections, provide an annular channel, an annular locking ring adapted to be forced into and out of said channel by a'substantially direct axial movement, and a lug formed upon the opposite face' of each of said sections having a flat outer face substantially perpendicular to the line of movementof said ring When being inscrted, and substantially tangential to the adjacent side face of the sections said lugs supporting said inwardly extending portions and thereby preventing deformation thereof and of said sections by the force applied in forcing said ring into and out of said channel.

3. A core of the character described comprising, a plurality of inwardly extending portions provided in one side face thereof with grooves, which, in the assembled condition of the sections, provide annular channels, an annular locking ring adapted to be forced into and out of said channel by a substantially direct axial movement, and lugs formed upon the opposite face of each of said sections at each end thereof having flat outer faces substantially perpendicular to the line of movement of said ring when being inserted and substantially tangential to the adjacent face of the section.

In testimony whereof I hereunto afliX my signature.

ALEXANDER GERMAN. 

